“Glock has been around, I think, for 20 years, and this is the first time they’ve ever been back-ordered. Ever.” — Krystal Westcott, a sales associate at California Police Equipment in City Heights

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The empty shelves inside the Chula Vista Gun Store (in mid-February) make it hard to tell the place sells guns at all. Last December, the amplification of the gun-control debate sent buyers rushing to this ...